<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
	<style type="text/css">
		html,
    body {
			width: 100%;
			height: 100%;
			margin: 0;
			padding: 0;
    }
    #map_container {
			width: 100%;
			height: 100%;
			margin: 0;
    }
	</style>
	<script type="text/javascript" src="https://api.map.baidu.com/api?type=webgl&v=1.0&ak=9Hl6gsN9gRvke7QGtEb7R6ZikNDGhakD"></script>
	<script src="https://mapv.baidu.com/gl/examples/static/common.js"></script>
	<script src="https://mapv.baidu.com/build/mapv.js"></script>
	<script src="https://code.bdstatic.com/npm/mapvgl@1.0.0-beta.54/dist/mapvgl.min.js"></script>
	<title>地图展示</title>
</head>
<body>
	<div id="map_container"></div>
	<script type="text/javascript">
		var map = initMap({
			tilt: 0,
			heading: 0,
			center: [103.438656,25.753594],
			zoom: 8,
			style: snowStyle,
			skyColors: [
				// 地面颜色
				'rgba(226, 237, 248, 0)',
				// 天空颜色
				'rgba(186, 211, 252, 1)'
			]
		});
		setData(initData());
		function initData() {
			var data = [];
			var citys = [
				'北京', '天津', '上海', '重庆', '石家庄', '太原', '呼和浩特', '哈尔滨', '长春',
				'沈阳', '济南', '南京', '合肥', '杭州', '南昌', '福州', '郑州', '武汉', '长沙', '广州',
				'南宁', '西安', '银川', '兰州', '西宁', '乌鲁木齐', '成都', '贵阳', '昆明', '拉萨', '海口'
			];
	    var randomCount = 700;
    	// 构造数据
    	while (randomCount--) {
        var cityCenter = mapv.utilCityCenter.getCenterByCityName(citys[parseInt(Math.random() * citys.length, 10)]);
        data.push({
					geometry: {
						type: 'Point',
						coordinates: [cityCenter.lng - 2 + Math.random() * 4, cityCenter.lat - 2 + Math.random() * 4]
					},
					properties: {
						count: Math.random() * 100
					}
        });
    	}
			return data;
		}
		function setData(data) {
			var view = new mapvgl.View({
        map: map
    	});

    	var intensity = new mapvgl.Intensity({
        max: 100,
        min: 0,
        gradient: {
					0: 'rgb(25, 66, 102, 0.8)',
					0.3: 'rgb(145, 102, 129, 0.8)',
					0.7: 'rgb(210, 131, 137, 0.8)',
					1: 'rgb(248, 177, 149, 0.8)'
        },
        maxSize: 30,
        minSize: 5
    	});

    	var pointLayer = new mapvgl.PointLayer({
        blend: 'lighter',
        size: function (data) {
					return intensity.getSize(data.properties.count);
        },
        color: function (data) {
					return intensity.getColor(data.properties.count);
        }
    	});

    	view.addLayer(pointLayer);
    	pointLayer.setData(data);
		}
	</script>	
</body>
</html>